27180221 has 8 divisors (see below), whose sum is σ = 28241400. Its totient is φ = 26127360.

The previous prime is 27180217. The next prime is 27180269. The reversal of 27180221 is 12208172.

It can be written as a sum of positive squares in 4 ways, for example, as 10048900 + 17131321 = 3170^2 + 4139^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27180221 - 2² = 27180217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27180271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5045 + ... + 8933.

It is an arithmetic number, because the mean of its divisors is an integer number (3530175).

Almost surely, 2^27180221 is an apocalyptic number.

It is an amenable number.

27180221 is a deficient number, since it is larger than the sum of its proper divisors (1061179).

27180221 is a wasteful number, since it uses less digits than its factorization.

27180221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4159.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 27180221 is about 5213.4653542533. The cubic root of 27180221 is about 300.6660055464. Note that the first 3 decimals are identical.

Adding to 27180221 its reverse (12208172), we get a palindrome (39388393).

The spelling of 27180221 in words is "twenty-seven million, one hundred eighty thousand, two hundred twenty-one".